Final answer:
The incorrect energy trend is "4s<3d" because the 4s orbitals are filled before the 3d orbitals in accordance with the aufbau principle.
Step-by-step explanation:
The question concerns the order of filling of electron orbitals in atom's electron configuration, which is a principle in chemistry. When examining the list of energy trends provided, to determine which trend is incorrect, one must consider the filling order of atomic orbitals according to the aufbau principle, which states that electrons fill orbitals starting at the lowest available energy states before filling higher states. Considering standard electron configurations and the energies of sublevels, the energy trend that is NOT correct is "4s<3d".
In multi-electron atoms, the 3d orbitals are actually higher in energy than the 4s orbitals, despite the fact that 'd' orbitals generally have more energy than 's' orbitals within the same principal quantum number (n). Therefore, according to the correct order, electrons fill the 4s orbital before the 3d orbital, resulting in the correct trend represented as "3d<4s". All other trends listed correctly follow the general filling order established by the observed experimental results and theoretical calculations.